WO2021095168A1 - 無線ｌａｎシステム、アクセスポイント装置及び無線通信方法 - Google Patents

無線ｌａｎシステム、アクセスポイント装置及び無線通信方法 Download PDF

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Publication number
WO2021095168A1
WO2021095168A1 PCT/JP2019/044562 JP2019044562W WO2021095168A1 WO 2021095168 A1 WO2021095168 A1 WO 2021095168A1 JP 2019044562 W JP2019044562 W JP 2019044562W WO 2021095168 A1 WO2021095168 A1 WO 2021095168A1
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WIPO (PCT)
Prior art keywords
terminal
terminals
access point
point device
cts
Prior art date
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Ceased
Application number
PCT/JP2019/044562
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English (en)
French (fr)
Japanese (ja)
Inventor
河村　憲一
泰司 鷹取
貴庸 守山
章太 中山
佳佑 若尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2021555698A priority Critical patent/JP7409393B2/ja
Priority to PCT/JP2019/044562 priority patent/WO2021095168A1/ja
Priority to US17/772,072 priority patent/US20220386374A1/en
Publication of WO2021095168A1 publication Critical patent/WO2021095168A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H04W74/06—Scheduled access using polling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a wireless LAN system, an access point device, and a wireless communication method.
  • Wireless LAN is widely used as a wireless access means because of its wide bandwidth and convenience that anyone can easily install it.
  • the frequency band used by the wireless LAN is typically the 2.4 GHz band and the 5 GHz band, and a license is not required. Therefore, anyone can install a wireless device (transmitter, receiver) and use a wireless LAN without applying.
  • CSMA / CA Carrier Sense Multiple Access / Collision Avoidance
  • STA Station, terminal station, slave unit
  • STA performs carrier sense before transmission, confirms that the channel has not been used for a certain period of time, and then starts transmission.
  • each terminal in the wireless LAN waits until the channel is used up, and then waits for transmission for a randomly selected number of slots in addition to a predetermined time, during which the channel is used. If not used, send a wireless frame. In this way, the plurality of terminals in the wireless LAN autonomously avoid collisions and perform wireless communication.
  • the transmitter may not be able to detect the radio wave condition around the receiver by carrier sense due to the influence of the distance between terminals and obstacles that do not allow radio waves to pass through. For example, if another radio that cannot receive radio waves from the transmitter is transmitting a radio frame that affects the receiver, the radio frame transmitted from the transmitter to the receiver will be on the receiver side. Causes a collision and a reception error occurs. Such a problem is called a hidden terminal problem.
  • the wireless LAN is equipped with RTS (Request to send) / CTS (Clear to send) procedures as standard technology in order to avoid the hidden terminal problem.
  • RTS Request to send
  • CTS Call to send
  • the transmitter first transmits a signal called RTS before transmitting the data frame.
  • the receiver receives the RTS, it transmits the CTS.
  • the transmitter transmits the actual data frame after confirming that the RTS / CTS exchange has been performed.
  • the time required to transmit the data frame to be transmitted is written in the duration field.
  • the terminal that receives the broadcasted RTS and CTS waits for transmission for the time written in the duration field.
  • this transmission standby is called NAV (Network Allocation Vector), and the media is set to be busy by virtual carrier sense. That is, the wireless LAN suppresses the transmission from the surrounding radios and reduces the interference by performing the RTS / CTS procedure before the transmission of the data frame.
  • NAV Network Allocation Vector
  • the wireless LAN standard continues to be specified with additional functions.
  • IEEE802.11ax see Non-Patent Document 2
  • MU-MIMO MultiUser MIMO
  • OFDMA Orthogonal frequency-division multiple access
  • the transmission of wireless frames is one-to-one communication (single user transmission).
  • access point devices AP devices, APs, base stations, master units
  • STAs terminals
  • resources wireless resources
  • resources can be allocated to a plurality of terminals on a subcarrier basis, and the access point device can simultaneously transmit to a plurality of terminals or receive from a plurality of terminals at the same time.
  • the minimum unit of resources that can be allocated in OFDMA is called a resource unit (RU: ResourceUnit).
  • MU-RTS Multi User RTS
  • CTS procedure which is an extension of the conventional RTS / CTS procedure, can be performed before transmission / reception of a data frame.
  • the access point device transmits the MU-RTS set to a plurality of terminals to be communicated with.
  • the terminal that has received the MU-RTS transmits the CTS after a predetermined waiting time if it is set as the destination.
  • CTS is transmitted from a plurality of terminals, it does not interfere with each other because it is transmitted at the timing of synchronization by MU-RTS in the order of microseconds.
  • IEEE Std 802.11-2016 IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements
  • Part 11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) 802.11-2012, p.1295-1580 IEEE P802.11ax / D4.0 Draft Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements
  • Part 11 Wireless LAN Medium Access Control (MAC) and Physical Layers (PHY) : Enhancements for High Efficiency WLAN, February 2019, p.69-272, p.295-440
  • a conventional wireless LAN system can ensure stable quality in an environment where the number of terminals is small and there is little interference from the surroundings, but when the number of terminals increases or the interference from the surroundings increases, the frame There is a problem that communication quality deteriorates due to collisions and frequent transmission standby.
  • VoIP Voice over IP
  • streaming video that require real-time performance
  • QoS Quality of Service
  • Non-Patent Document 1 Quality of Service
  • a terminal belonging to a predetermined BSS Base Service Set
  • OBSS Overlapping BSS
  • delay and jitter are not guaranteed, and low delay and low delay and It was not possible to provide an application that requires low jitter.
  • RTS / CTS or MU-RTS / CTS there is a possibility that other wireless LAN devices such as access point devices exist outside the reach of the signal transmitted from the terminal.
  • the protection by RTS / CTS and MU-RTS / CTS does not work well, and a wireless LAN device such as another access point device may become an interference source for the terminal.
  • An object of the present invention is to provide a wireless LAN system, an access point device, and a wireless communication method capable of protecting the communication opportunity of a predetermined terminal and improving the communication quality.
  • the wireless LAN system is a wireless LAN system in which multi-user transmission by OFDMA is performed between a plurality of terminals and one or more access point devices, and the access point device is a resource for transmitting data.
  • the terminal satisfying the predetermined condition is determined by the frame of the MU-RTS so as to include at least the terminal to be protected that should satisfy the predetermined low delay and low jitter.
  • a selection unit selected as a terminal for transmitting CTS, an allocation unit for allocating resources for transmitting data to the terminal, and a MU-RTS frame are generated so that the terminal selected by the selection unit transmits CTS.
  • the access point device is an access point device that performs multi-user transmission by OFDMA to and from a plurality of terminals, regardless of whether or not it is a terminal to which a resource for transmitting data should be allocated.
  • a selection unit that selects terminals that satisfy predetermined conditions as terminals for transmitting CTS in the MU-RTS frame so as to include at least terminals to be protected that should satisfy predetermined low delay and low jitter.
  • It has a frame generation unit that generates a frame including, and a communication unit that transmits each of the frames generated by the frame generation unit to a plurality of terminals, and the selection unit is the number of terminals to which the allocation unit allocates resources. It is characterized by selecting the above number of terminals.
  • the wireless communication method is a wireless communication method in which multi-user transmission by OFDMA is performed between a plurality of terminals and one or more access point devices, and a terminal to which a resource for transmitting data should be allocated. Regardless of whether or not, a terminal satisfying a predetermined condition is made to transmit CTS in a frame of MU-RTS so as to include at least a terminal to be protected that should satisfy a predetermined low delay and low jitter.
  • the selection process includes a frame generation step of generating a frame including the above and a communication step of transmitting each of the generated frames to a plurality of terminals, and the selection process includes terminals having a number equal to or larger than the number of terminals to which resources are allocated in the allocation process. It is characterized by being elected.
  • the selection unit 210 selects more terminals than the number of terminals to which the allocation unit 214 allocates resources. For example, the selection unit 210 has a low level of RSSI (Received Signal Strength Indicator) in a terminal specified (set) in advance, a terminal randomly specified from a plurality of terminals belonging to the access point device 2, and the access point device 2.
  • RSSI Received Signal Strength Indicator
  • a terminal is selected as a terminal specified in order from the side or a terminal specified in order from the one with the largest amount of interference from the OBSS as a terminal satisfying one of the predetermined conditions.
  • the terminal 3 notifies the access point device 2 of the amount of interference from the OBSS.
  • the access point device 2c transmits a trigger frame after receiving the CTS from the terminals 3a and 3b.
  • the trigger frame the address of the terminal 3 to which the resource is allocated to the User Info field and the RU to be assigned to the terminal 3 are described.
  • the access point device 2c describes the RU assigned to the terminals 3a and 3b in the trigger frame.
  • the access point device 2a describes the information (address, etc.) that specifies the terminals 3a, 3b, and 3c, and the band in which each of the terminals 3a, 3b, and 3c should transmit the CTS in the User Info field. Send.
  • the access point device 2b (and other terminals) existing outside the reach range 300a of the radio wave (CTS) from the terminal 3a does not have the NAV set by the CTS from the terminal 3a. Not done. However, in the access point device 2b (and other terminals), the NAV is set by the CTS transmitted by the terminal 3c.
  • CTS radio wave
  • the access point device 2a specifies information indicating the terminal to be protected and the terminal to which the CTS should be transmitted by the MU-RTS (S106).
  • the determination unit 212 determines whether or not the access point device 2a causes the terminal 3c to transmit the CTS based on the positional relationship between the terminals 3a, 3b, 3c and the access point device 2b, the radio wave intensity, and the like. Good.
  • the RU is not assigned (designated) to the terminal group by the trigger frame, but the OFDMA data frame is preambled. RU is assigned by.
  • Wireless LAN system 2a, 2b, 2c ... Access point device, 3a, 3b, 3c ... Terminal, 20 ... Setting unit, 21,31 ... Control unit, 22, 32. .. Frame generation unit, 23, 33 ... Communication unit, 24, 34 ... Antenna, 25, 35 ... Communication I / F unit, 210 ... Selection unit, 212 ... Judgment unit, 214 ... Allocation unit, 230, 330 ... Signal transmission / reception unit, 232,332 ... RF unit, 200a, 200b, 200c, 300a, 300b, 300c ... Reachable range

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2019/044562 2019-11-13 2019-11-13 無線ｌａｎシステム、アクセスポイント装置及び無線通信方法 Ceased WO2021095168A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2021555698A JP7409393B2 (ja) 2019-11-13 2019-11-13 無線ｌａｎシステム、アクセスポイント装置及び無線通信方法
PCT/JP2019/044562 WO2021095168A1 (ja) 2019-11-13 2019-11-13 無線ｌａｎシステム、アクセスポイント装置及び無線通信方法
US17/772,072 US20220386374A1 (en) 2019-11-13 2019-11-13 Wireless lan system, access point device, and wireless communication method

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Application Number Priority Date Filing Date Title
PCT/JP2019/044562 WO2021095168A1 (ja) 2019-11-13 2019-11-13 無線ｌａｎシステム、アクセスポイント装置及び無線通信方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025057337A1 (ja) * 2023-09-13 2025-03-20 日本電信電話株式会社 アクセスポイント及び無線端末装置
JP2025065915A (ja) * 2023-10-10 2025-04-22 株式会社博報堂 音声データ分析装置、音声データ分析方法およびコンピュータプログラム

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114302496A (zh) * 2021-12-17 2022-04-08 深圳市联平半导体有限公司 数据发送方法、装置、存储介质、处理器及ap终端

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017523647A (ja) * 2014-06-19 2017-08-17 エルジー エレクトロニクス インコーポレイティド フレームを送信する方法及び装置
US20180109298A1 (en) * 2016-10-14 2018-04-19 Qualcomm Incorporated Techniques for mu-mimo sounding sequence protection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016526856A (ja) 2013-07-11 2016-09-05 インターデイジタル パテント ホールディングス インコーポレイテッド セクタ化調整をサポートするための方法および装置
WO2017039377A1 (ko) * 2015-09-02 2017-03-09 주식회사 윌러스표준기술연구소 네트워크 얼로케이션 벡터를 이용하는 무선 통신 방법 및 무선 통신 단말

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017523647A (ja) * 2014-06-19 2017-08-17 エルジー エレクトロニクス インコーポレイティド フレームを送信する方法及び装置
US20180109298A1 (en) * 2016-10-14 2018-04-19 Qualcomm Incorporated Techniques for mu-mimo sounding sequence protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025057337A1 (ja) * 2023-09-13 2025-03-20 日本電信電話株式会社 アクセスポイント及び無線端末装置
JP2025065915A (ja) * 2023-10-10 2025-04-22 株式会社博報堂 音声データ分析装置、音声データ分析方法およびコンピュータプログラム

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US20220386374A1 (en) 2022-12-01
JP7409393B2 (ja) 2024-01-09
JPWO2021095168A1 (https=) 2021-05-20

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